GTH Frame Timeslot Interleaving for Optical Bandwidth Allocation
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Solution Overview
Problem
Current optical transmission networks face challenges in aligning frame headers of working and protection channels, leading to delays and dual-transmission failures when bandwidth maps differ, and struggle with multiplexing services across lines of different rates, resulting in complex dynamic bandwidth assignment and bandwidth fragmentation.
Innovation Solution
The method involves dividing the payload area of a generic transport hierarchy frame into arrays of specified timeslots, calculating timeslot positions based on bandwidth information, and interleaving transmission containers into corresponding timeslots to create a GTH frame, ensuring even allocation and flexible bandwidth adjustment for multiple services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic bandwidth adjustment is implemented on a ring network, then bandwidth utilization is improved, but frame header alignment between working and protection channels deteriorates, causing dual-transmission failures
Solution Approach 1:
The invention segments the bandwidth allocation into two independent parts: a fixed portion for frame header alignment and a dynamic portion for flexible bandwidth adjustment. The fixed portion ensures that working and protection channels maintain synchronized frame headers, while the dynamic portion allows bandwidth optimization. This segmentation resolves the contradiction by decoupling the alignment requirement from the bandwidth adjustment mechanism.
Solution Approach 2:
The invention changes the parameter of bandwidth allocation from completely dynamic to a hybrid model with fixed and dynamic components. By introducing a fixed bandwidth parameter for frame header alignment and a dynamic parameter for service bandwidth, the system achieves both reliable dual-transmission and improved bandwidth utilization through parameter optimization.
2Adaptability or versatility
If bandwidth maps differ between working and protection channels, then flexible bandwidth allocation is improved, but frame header alignment deteriorates, leading to transmission delays
Solution Approach 1:
The bandwidth map is segmented into fixed and dynamic portions. The fixed portion maintains identical timing structures in working and protection channels to ensure frame header alignment, while the dynamic portion allows flexible bandwidth allocation. This segmentation enables the system to achieve both adaptability and time efficiency simultaneously.
Solution Approach 2:
The invention performs preliminary alignment of frame headers using a fixed bandwidth portion before dynamic bandwidth adjustment is applied to service data. This preliminary action ensures that the timing synchronization is established in advance, preventing transmission delays even when dynamic bandwidth allocation is subsequently applied.
3Adaptability or versatility
If services are multiplexed across lines of different rates, then service versatility is improved, but dynamic bandwidth assignment complexity increases
Solution Approach 1:
The invention changes the approach to handling different rate lines by introducing a unified timing reference parameter. All services, regardless of their source line rate, are synchronized to a common timing structure. This parameter change simplifies the dynamic bandwidth assignment process while maintaining the ability to multiplex diverse services across different rate lines.
Solution Approach 2:
The invention creates a universal bandwidth assignment mechanism that can handle multiple service types and line rates through a unified framework. The fixed-bandwidth portion provides a universal timing structure, while the dynamic portion adapts to specific service requirements, achieving versatility without proportional increases in complexity.
4Adaptability or versatility
If conventional dynamic bandwidth assignment is used, then bandwidth flexibility is improved, but bandwidth fragmentation occurs, reducing utilization efficiency
Solution Approach 1:
The bandwidth is segmented into fixed and dynamic portions, where the fixed portion prevents fragmentation by maintaining continuous allocation for frame header alignment, and the dynamic portion provides flexibility for service-specific bandwidth adjustment. This segmentation eliminates the bandwidth fragmentation problem while preserving flexibility.
Solution Approach 2:
The invention changes the bandwidth allocation parameter from purely dynamic to a hybrid fixed-dynamic model. This parameter change ensures that the fixed portion maintains continuous, non-fragmented allocation for critical functions, while the dynamic portion optimizes service bandwidth without causing fragmentation, thereby improving overall utilization efficiency.
Data Source
AI summary
A method and an apparatus for transmitting multiple services are provided, and which belong to the field of optical transmission technologies. The method includes: receiving bandwidth information of TCONTs of all nodes; dividing a payload area of a GTH frame into a preset number n of arrays, where each array includes a specified number of timeslots and the interval between any two neighboring timeslots in each array is n and n is a natural number; calculating, according to the bandwidth information of the TCONTs of all the nodes, timeslot positions of arrays occupied by the TCONTs of each node in the payload area; interleaving, according to the timeslot positions of the arrays occupied by the TCONTs of a local node in the payload area, the TCONTs of the local node into corresponding timeslots starting from a specified frame, obtaining a GTH frame, and transmitting the GTH frame.